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Ohm's Law • Voltage • Volts

Calculate Voltage

Calculate voltage from current and resistance.

Calculation Values

Note: This calculation is a technically sound simplification typical of online calculators. For practical sizing, standards, installation method, temperature, grouping, protective devices, cable type and manufacturer specifications must also be checked.

Formula Used

U = R × I

U is the voltage in volts, R the resistance in ohms and I the current in amps.

FAQ

Frequently Asked Questions about Calculate Voltage Using Ohm's Law

Briefly explained: formula, use case and key limits of the calculation.

Which formula does the calculator use? +

The calculator uses Ohm's law U = R × I.

What do U, R and I mean? +

U is voltage in volts, R is resistance in ohms and I is current in amps.

When does Ohm's law apply? +

Ohm's law applies to resistive conductors where resistance remains approximately constant under the conditions considered.

Can I use this to design mains installations? +

No. Ohm's law is a basic formula. Installations require further electrical engineering rules and standards.

Practical guidance

Understand voltage using Ohm's law

U = I × R applies to the current and resistance under consideration and is useful for linear resistive loads and voltage drops.

Input values explained

Current
Enter the expected operating current, not a fuse rating. Motors and electronic power supplies may draw much higher starting or peak currents.
Resistance
Enter the effective electrical resistance in ohms. For a cable, clarify whether the value covers one conductor or the complete current path.

Example: 2 A through 12 ohms

A current of 2 A flows through a 12 Ω resistance.

U = 2 A × 12 Ω = 24 V

The voltage is 24 V and the component dissipates P = U × I = 48 W.

Know where the simple law applies

Temperature-dependent, inductive and capacitive components may not have a constant resistance. AC may require impedance instead.

Calculation limits

  • Dynamic and frequency-dependent behaviour is excluded.
  • Power dissipation, temperature and voltage ratings still need checking.